| Author | Topic |
|---|
Location:
Northwestern Sydney
Registered:
August 2002
|
 Broken Cam Shaft.
|
Thu, 26 August 2004 01:05
|
 |
This has been fixed and replaced long ago. But I was thinking about it the other day. A few years ago when I bourght my sprinter about 3 days after I bourght it, the engine choked and cut out on me driving to work. After looking I couldn't find anything wrong (fuel/spark wise) and had it towed home. That night I went over the car and being new decided to give it a tune up and new fluids. whilst trying unsucsessfully to time the car I had a look in the oil filler hole as the car was turning over and noticed the cam wasn't spinning. I pulled the cover off thinking I'd broken a timing chain. To my surprise the cam shaft had sheared in half roughly in the middle!
My question: What would cause that? As I've never come across this before?
|
|
|
I Supported Toymods
Location:
Sydney
Registered:
December 2002
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 01:31
|
|
I would think that this could only happen if something stopped the cam from spinning.
Maybe a seized valve or really really badly adjusted one... or even a shim floating around in the cam area and getting jammed under it.
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 02:03
|
|
This can also happen when the head warps, causing the camshaft bearings to bind.
|
|
|
I Supported Toymods
Location:
Sydney
Registered:
December 2002
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 02:27
|
|
That'd have to be some serious warpage!
|
|
|
I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 02:37
|
|
|
Yep I've had a cam break in an 18RC'd Hilux once, was driving it around the farm and it just died, like you mention Simon. One low Km motor later, the ute is still trundling around! I'd suggest it was more a fatigue issue than binding, and not a common issue that I know of?!
|
|
|
Location:
Northwestern Sydney
Registered:
August 2002
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 03:26
|
|
Yeah. I don't think there was any binding of bearings as they appeared fine. the cam shaft was replace nothing was done to the head and the car trundled on for another 18 months / 70,000km before it had it's front end modified to look like a Vectra's rear bumper.
Always been curious as the mechanic couldn't tell me. Maybe just a dud cam due to go?
|
|
|
Location:
Brisbane
Registered:
October 2002
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 10:37
|
|
|
my mate worked 4 subaru a while ago and an STi with 5 k {not 500k, 5k} snapped a cam shaft while on a slow {i'm serious} drive around the block
|
|
|
Location:
Brisbane
Registered:
February 2003
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 10:51
|
|
when i had the head in my galant welded (BHG and corrosion) and re-straightened at bryant engineering, they line bored the cam tunnel.
old alloy heads that get welded do walk around a bit and can grab the cam - if you have new bearings and rebuilt cam (finer tolerance between wear face and bearing).
|
|
|
I Supported Toymods
Location:
Sydney
Registered:
December 2002
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 11:50
|
|
| Mr DOHC wrote on Thu, 26 August 2004 20:37 |
my mate worked 4 subaru a while ago and an STi with 5 k {not 500k, 5k} snapped a cam shaft while on a slow {i'm serious} drive around the block
|
I used to work for a certain island car terminal and I can assure you that in those first 5kms of any WRX's life the car would have seen some of the hardest driving it will ever get!
Shiney metal decks with fog condensation on them... 40+ crazy australian's, several hundred high performance import cars and an asian crew who couldn't speak a word of english!
I still remember an incident involving a 3 sti pileup on the ramp deck... feel sorry for whoever eventually bought those cars
|
|
|
Location:
South West Sydney
Registered:
February 2004
|
|
Re: Broken Cam Shaft.
|
Thu, 26 August 2004 12:47
|
|
|
Had a 4ac break a cam. One journal was rooted never really looked for a reason.
|
|
|
